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Expression, purification, and characterization of thymidylate synthase from Lactococcus lactis
Author(s) -
Greene Patricia J.,
Yu PakLam,
Zhao Jia,
Schiffer Celia A.,
Santi Daniel
Publication year - 1994
Publication title -
protein science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.353
H-Index - 175
eISSN - 1469-896X
pISSN - 0961-8368
DOI - 10.1002/pro.5560030715
Subject(s) - lactococcus lactis , thymidylate synthase , chemistry , biochemistry , biology , microbiology and biotechnology , bacteria , genetics , lactic acid , fluorouracil , chemotherapy
The thymidylate synthase (TS) gene from Lactococcus lactis has been highly expressed in Escherichia coli. The TS protein was purified by sequential chromatography on Q‐Sepharose and phenyl‐Sepharose. Six grams of cell pellet yielded 140 mg of homogeneous TS. TS is a highly conserved enzyme, and several of the conserved amino acid residues that have been implicated in catalytic function are altered in L. lactis TS. By use of a 3‐dimensional homology model, we have predicted covariant changes that might compensate for these differences. With the large amounts of L. lactis TS now available, studies can be pursued to understand the structure‐function relationships of this enzyme compared to other TSs and to confirm the presumed roles of the compensatory changes predicted in the homology model.